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<div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h2"><td colspan="5"> 标号</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="statements.html#.E6.A0.87.E5.8F.B7" title="c/language/statements"><span class="t-lines"><span><span class="t-spar">label</span> : <span class="t-spar">statement</span></span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> 表达式语句</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="statements.html#.E8.A1.A8.E8.BE.BE.E5.BC.8F.E8.AF.AD.E5.8F.A5" title="c/language/statements"><span class="t-lines"><span><span class="t-spar">expression</span> ;</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> 复合语句</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="statements.html#.E5.A4.8D.E5.90.88.E8.AF.AD.E5.8F.A5" title="c/language/statements"><span class="t-lines"><span>{ <span class="t-spar">statement</span>... }</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> 选择语句</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="if.html" title="c/language/if"><span class="t-lines"><span>if</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="switch.html" title="c/language/switch"><span class="t-lines"><span>switch</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> 迭代语句</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="while.html" title="c/language/while"><span class="t-lines"><span>while</span></span></a></div></div></td></tr>
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<tr class="t-nv-h2"><td colspan="5"> 跳转语句</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="break.html" title="c/language/break"><span class="t-lines"><span>break</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="continue.html" title="c/language/continue"><span class="t-lines"><span>continue</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="return.html" title="c/language/return"><span class="t-lines"><span>return</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>goto</span></span></strong></div></div></td></tr>
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</div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<p>将控制无条件转移到所欲位置。
</p><p>在无法用约定的构造将控制转移到所欲位置时使用。
</p>
<h3><span class="mw-headline" id=".E8.AF.AD.E6.B3.95">语法</span></h3>
<table class="t-sdsc-begin">

<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr>
<tr class="t-sdsc">
<td class="t-sdsc-nopad"> <code><b>goto</b></code> <span class="t-spar">标号</span> <code><b>;</b></code>
</td>
<td class="t-sdsc-nopad">
</td>
<td class="t-sdsc-nopad">
</td></tr>



<tr>
<td colspan="10" class="t-sdsc-sep">
</td></tr>
<tr class="t-sdsc">
<td class="t-sdsc-nopad"> <span class="t-spar">标号</span> <code><b>:</b></code> <span class="t-spar">语句</span>
</td>
<td class="t-sdsc-nopad">
</td>
<td class="t-sdsc-nopad">
</td></tr>



<tr>
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</td></tr></table>
<h3><span class="mw-headline" id=".E8.A7.A3.E9.87.8A">解释</span></h3>
<p><code>goto</code> 语句导致无条件跳转（控制的转译）到前附具名 <span class="t-spar">标号</span> （必须与 goto 语句出现于同一函数中）的语句<span class="t-rev-inl t-since-c99"><span>，除非此跳转会进入<a href="array.html" title="c/language/array">变长度数组</a>或另一<a href="declarations.html" title="c/language/declarations">可变修改类型</a>的作用域</span> <span><span class="t-mark-rev t-since-c99">(C99 起)</span></span></span>。
</p><p><span class="t-spar">标号</span> 是一个后随冒号（ : ）和一条语句的的标识符。标号是仅有的拥有<i>函数作用域</i>的标识符：能在其所出现于的函数中的任何位置使用它们（在 goto 语句中）。任何语句前可以有多个标号。
</p>
 <table class="t-rev-begin">
<tr class="t-rev t-since-c99"><td>
<p>容许进入非可变修改对象的作用域：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="kw1">goto</span> lab1<span class="sy4">;</span> <span class="co1">// OK ：进入常规变量的作用域</span>
    <span class="kw4">int</span> n <span class="sy1">=</span> <span class="nu0">5</span><span class="sy4">;</span>
lab1<span class="sy4">:;</span> <span class="co1">// 注意未初始化 n ，如同以 int n; 声明</span>
 
<span class="co1">//   goto lab2;   // 错误：进入二个 VM 类型的作用域</span>
     <span class="kw4">double</span> a<span class="br0">[</span>n<span class="br0">]</span><span class="sy4">;</span> <span class="co1">// VLA</span>
     <span class="kw4">int</span> <span class="br0">(</span><span class="sy2">*</span>p<span class="br0">)</span><span class="br0">[</span>n<span class="br0">]</span><span class="sy4">;</span> <span class="co1">// VM 指针</span>
lab2<span class="sy4">:</span></pre></div></div>
<p>若 <code>goto</code> 离开 VLA 的作用域，则 VLA 会被解分配（而且可能会被再分配，若再度执行其初始化）： 
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="br0">{</span>
   <span class="kw4">int</span> n <span class="sy1">=</span> <span class="nu0">1</span><span class="sy4">;</span>
label<span class="sy4">:;</span>
   <span class="kw4">int</span> a<span class="br0">[</span>n<span class="br0">]</span><span class="sy4">;</span> <span class="co1">// 重分配 10 次，每次拥有不同的大小</span>
   <span class="kw1">if</span> <span class="br0">(</span>n<span class="sy2">++</span> <span class="sy1">&lt;</span> <span class="nu0">10</span><span class="br0">)</span> <span class="kw1">goto</span> label<span class="sy4">;</span> <span class="co1">// 离开 VM 的作用域</span>
<span class="br0">}</span></pre></div></div>
</td>
<td><span class="t-mark-rev t-since-c99">(C99 起)</span></td></tr>
</table>
<h3><span class="mw-headline" id=".E5.85.B3.E9.94.AE.E8.AF.8D">关键词</span></h3>
<p><a href="../keyword/goto.html" title="c/keyword/goto"><tt>goto</tt></a>
</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
<p>因为声明不是语句，在声明前的标号必须使用空语句（紧随冒号后的分号）。同样的规则适用于块结尾前的标号。
</p><p>C++ 在 <code>goto</code> 语句上加上了另外的限制，不过允许标号在声明（它们在 C++ 中是语句）前。
</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="co1">// goto 可用于简单地离开多层循环</span>
    <span class="kw1">for</span> <span class="br0">(</span><span class="kw4">int</span> x <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> x <span class="sy1">&lt;</span> <span class="nu0">3</span><span class="sy4">;</span> x<span class="sy2">++</span><span class="br0">)</span> <span class="br0">{</span>
        <span class="kw1">for</span> <span class="br0">(</span><span class="kw4">int</span> y <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> y <span class="sy1">&lt;</span> <span class="nu0">3</span><span class="sy4">;</span> y<span class="sy2">++</span><span class="br0">)</span> <span class="br0">{</span>
            <a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"(%d;%d)<span class="es1">\n</span>"</span>,x,y<span class="br0">)</span><span class="sy4">;</span>
            <span class="kw1">if</span> <span class="br0">(</span>x <span class="sy2">+</span> y <span class="sy1">&gt;=</span> <span class="nu0">3</span><span class="br0">)</span> <span class="kw1">goto</span> endloop<span class="sy4">;</span>
        <span class="br0">}</span>
    <span class="br0">}</span>
endloop<span class="sy4">:;</span>
<span class="br0">}</span></pre></div></div>
<p>输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">(0;0)
(0;1)
(0;2)
(1;0)
(1;1)
(1;2)</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">引用</span></h3>
<div class="t-ref-std-11">
<ul><li> C11 standard (ISO/IEC 9899:2011): 
</li></ul>
<dl><dd><ul><li> 6.8.6.1 The goto statement (p: 152-153)
</li></ul>
</dd></dl>
<div class="t-ref-std-c99">
<ul><li> C99 standard (ISO/IEC 9899:1999): 
</li></ul>
<dl><dd><ul><li> 6.8.6.1 The goto statement (p: 137-138)
</li></ul>
</dd></dl>
<div class="t-ref-std-c89">
<ul><li> C89/C90 standard (ISO/IEC 9899:1990): 
</li></ul>
<dl><dd><ul><li> 3.6.6.1 The goto statement 
</li></ul>
</dd></dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

</table></div>
</div>

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